Gas sensor set - MQ-2, MQ-3, MQ-4, MQ-5, MQ-6, MQ-7, MQ-8, MQ-9, MQ-135

Product Overview

• Sensor kit with five gas sensors for Arduino and compatible boards
• MQ-2 detects combustible gases and smoke, with a measuring range of up to 10000 ppm
• MQ-3 measures alcohol vapor and is particularly suitable for breath analysis
• MQ-4 detects methane and natural gas, with a range of up to 10000 ppm
• MQ-5 is specialized for liquefied petroleum gas and carbon monoxide, with sensitivity up to 2000 ppm
• Analog voltage outputs for direct connection to ADC inputs
• Each sensor includes a simple, assembled and calibratable breakout board

Product Description

A gas sensor kit brings five different sensors for detecting various gases to Arduino boards and similar platforms. Each sensor uses a semiconductor element whose electrical resistance changes when it comes into contact with certain gases. This change in resistance is output as a voltage signal and measured by the board's ADC input.

The five sensors cover various application areas. The MQ-2 is suitable for smoke detection in rooms and monitoring combustible gases; the MQ-3 measures alcohol vapor and is used in portable devices for breath analysis; the MQ-4 focuses on methane and natural gas with a wide measuring range; the MQ-5 covers liquefied petroleum gas and carbon monoxide. A typical project is an automatic gas warning system for laboratories or storage facilities that triggers an alarm when a threshold is reached.

Each sensor breakout board has an analog output that can be connected directly to an analog input of the Arduino. The sensor requires an operating voltage of about 5 V to heat the sensitive element; the signal voltage is between 0 and 5 V and is directly compatible with 5 V Arduino boards. A digital comparator circuit on the boards also enables discrete on/off signals via a selectable threshold.

Before use, the sensors must warm up for about 20 seconds so that the heater can stabilize. Calibration is possible, but can often be skipped when the relative gas concentration is sufficient. The datasheet specifies a calibration function for each sensor type. The sensors are designed for operation at room temperature; long-term measurement accuracy during temperature changes can be improved through reference measurements.

Safety Notice

The sensors are intended exclusively for building prototypes and for testing and development purposes and are not intended for integration into safety-critical alarm systems. If measured values indicate dangerous gas concentrations, leave the room immediately and contact a qualified electrician or the emergency services. The kit is not intended for operation on household electrical installations or for monitoring mains voltages.

Scope of Delivery

• 1x Gas detection sensor set Sensorkit Gas (for Arduino) MQ-2, MQ-3, MQ-4, MQ-5, MQ-6, MQ-7, MQ-8, MQ-9, MQ-135